package com.atguigu.edu.app.dws;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.atguigu.edu.app.BaseApp;
import com.atguigu.edu.bean.TradeOrderBean;
import com.atguigu.edu.common.Constant;
import com.atguigu.edu.util.AtguiguUtil;
import com.atguigu.edu.util.FlinkSinkUtil;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.functions.ReduceFunction;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.streaming.api.functions.windowing.AllWindowFunction;
import org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.streaming.api.windowing.windows.TimeWindow;
import org.apache.flink.util.Collector;

import java.time.Duration;

public class Dws_10_TradeOrderWindow extends BaseApp {
    public static void main(String[] args) {
        new Dws_10_TradeOrderWindow().init(
                4010,
                2,
                "Dws_10_TradeOrderWindow",
                Constant.TOPIC_DWD_TRADE_ORDER_DETAIL
        );
    }
    @Override
    public void handle(StreamExecutionEnvironment ev, DataStreamSource<String> stream) {
        stream
                .map(JSON::parseObject)
                .assignTimestampsAndWatermarks(
                        WatermarkStrategy
                                .<JSONObject>forBoundedOutOfOrderness(Duration.ofSeconds(3))
                                .withTimestampAssigner((obj, ts) -> obj.getLong("ts") * 1000)
                                .withIdleness(Duration.ofSeconds(60))
                )
                .keyBy(obj -> obj.getString("user_id"))
                .process(new KeyedProcessFunction<String, JSONObject, TradeOrderBean>() {

                    private ValueState<String> lastOrderDateState;

                    @Override
                    public void open(Configuration parameters) throws Exception {
                        lastOrderDateState = getRuntimeContext().getState(new ValueStateDescriptor<String>("lastOrderDate", String.class));
                    }

                    @Override
                    public void processElement(JSONObject obj,
                                               Context ctx,
                                               Collector<TradeOrderBean> out) throws Exception {
                        long ts = obj.getLong("ts") * 1000;
                        String today = AtguiguUtil.tsToDate(ts);

                        // 下单独立用户数
                        Long orderUniqueUserCount = 0L;

                        // 下单新用户数
                        Long orderNewUserCount = 0L;

                        String lastOrderDate = lastOrderDateState.value();

                        if (!today.equals(lastOrderDate)) {
                            orderUniqueUserCount = 1L;
                            lastOrderDateState.update(today);
                            if (lastOrderDate == null) {
                                orderNewUserCount = 1L;
                            }
                        }

                        if (orderUniqueUserCount == 1) {
                            out.collect(new TradeOrderBean(
                                    "", "",
                                    orderUniqueUserCount, orderNewUserCount,
                                    ts
                            ));
                        }

                    }
                })
                .windowAll(TumblingEventTimeWindows.of(Time.seconds(5)))
                .reduce(
                        new ReduceFunction<TradeOrderBean>() {
                            @Override
                            public TradeOrderBean reduce(TradeOrderBean value1,
                                                         TradeOrderBean value2) throws Exception {
                                value1.setOrderUniqueUserCount(value1.getOrderUniqueUserCount()+value2.getOrderUniqueUserCount());
                                value1.setOrderNewUserCount(value1.getOrderNewUserCount()+value2.getOrderNewUserCount());
                                return value1;
                            }
                        },
                        new AllWindowFunction<TradeOrderBean, TradeOrderBean, TimeWindow>() {
                            @Override
                            public void apply(TimeWindow window,
                                              Iterable<TradeOrderBean> values,
                                              Collector<TradeOrderBean> out) throws Exception {
                                TradeOrderBean bean = values.iterator().next();
                                bean.setStt(AtguiguUtil.tsToDateTime(window.getStart()));
                                bean.setEdt(AtguiguUtil.tsToDateTime(window.getEnd()));

                                bean.setTs(System.currentTimeMillis());

                                out.collect(bean);
                            }
                        }
                )
                .addSink(FlinkSinkUtil.getClickHouseSink("dws_trade_order_window", TradeOrderBean.class));
    }
}
